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<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Promise关键问题 - Promise then方法的返回结果特点</title>
</head>
<body>
	<script>
		let p = new Promise((resolve,reject)=>{
			resolve('OK')
		})
		//执行 then 方法
		let result = p.then(value =>{
			//console.log(value);
			//1. 抛出错误
			//throw '出了问题'
			//2. 返回结果是非 promise 类型的对象
			//return 521
			//3. 返回结果是 Promise 对象
			//return new Promise((resolve,reject)=>{
			//	//resolve('success')
			//	reject('error')
			//})
		},reason=>{
			console.warn(reason)
		})
	</script>
</body>
</html>